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Title: Miniaturized disk-bend testing, nano-indentation and the microstructure of ion-irradiated titanium aluminides

Abstract

Effect of ion irradiation on microstructures and mechanical properties of Ti-52Al (TiAl) and Ti-26Al (Ti{sub 3}Al) were investigated. The alloys were irradiated with 2 MeV protons and Ar{sup +} ions at low temperatures ({minus}175 to {minus}135C) to max fluences of 4.5 {times} 10{sup 15} Ar{sup +}/cm{sup 2} and 2 {times} 10{sup 17} H{sup +}/cm{sup 2}. Yield strengths of unirradiated TiAl and the fracture strength of unirradiated Ti{sub 3}Al were 367 {plus_minus} 33 MPa and 536 {plus_minus} 30 MPa, respectively, in excellent agreement with published data. Yield strength of TiAl and fracture strength of Ti{sub 3}Al increased as a result of irradiation. Strengths of both alloys were lowest for the samples irradiated to the highest Ar{sup +}-ion dose, but otherwise there was no correlation of strength with dose. The nanohardness of irradiated specimens generally increased with dose, but influence of dose on Young`s modulus was erratic. Plate-shaped defects vacancy in character, and helical dislocations were observed in irradiated TiAl by TEM. The Ar{sup +}-ion irradiation-induced microstructure of Ti{sub 3}Al contained defects producing mottled contrast at 1 dpa and black-spot contrast at 5 dpa. Irradiation-induced loss of long-range order was also observed in both alloys. Influence of these microstructural variables on mechanicalmore » behavior is discussed.« less

Authors:
;  [1]; ;  [2]
  1. California Univ., Los Angeles, CA (United States). Dept. of Materials Science and Engineering
  2. Oak Ridge National Lab., TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab., TN (United States); California Univ., Los Angeles, CA (United States). Dept. of Materials Science and Engineering; Oak Ridge Associated Universities, Inc., TN (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
10186293
Report Number(s):
CONF-930997-5
ON: DE93040600; TRN: 93:023907
DOE Contract Number:  
AC05-84OR21400; FG03-86ER45264; AC05-76OR00033
Resource Type:
Conference
Resource Relation:
Conference: 1. international symposium on structural intermetallics,Champion, PA (United States),26-30 Sep 1993; Other Information: PBD: [1993]
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; TITANIUM BASE ALLOYS; PHYSICAL RADIATION EFFECTS; ALUMINIUM ALLOYS; YOUNG MODULUS; YIELD STRENGTH; FRACTURE PROPERTIES; INTERMETALLIC COMPOUNDS; ARGON IONS; ION BEAMS; PROTON BEAMS; MEV RANGE 01-10; RADIATION DOSES; MICROSTRUCTURE; DEPTH; TRANSMISSION ELECTRON MICROSCOPY; MICROHARDNESS; 360106; RADIATION EFFECTS

Citation Formats

Petouhoff, N L, Ardell, A J, Oliver, W C, and Lucas, B N. Miniaturized disk-bend testing, nano-indentation and the microstructure of ion-irradiated titanium aluminides. United States: N. p., 1993. Web.
Petouhoff, N L, Ardell, A J, Oliver, W C, & Lucas, B N. Miniaturized disk-bend testing, nano-indentation and the microstructure of ion-irradiated titanium aluminides. United States.
Petouhoff, N L, Ardell, A J, Oliver, W C, and Lucas, B N. Wed . "Miniaturized disk-bend testing, nano-indentation and the microstructure of ion-irradiated titanium aluminides". United States. https://www.osti.gov/servlets/purl/10186293.
@article{osti_10186293,
title = {Miniaturized disk-bend testing, nano-indentation and the microstructure of ion-irradiated titanium aluminides},
author = {Petouhoff, N L and Ardell, A J and Oliver, W C and Lucas, B N},
abstractNote = {Effect of ion irradiation on microstructures and mechanical properties of Ti-52Al (TiAl) and Ti-26Al (Ti{sub 3}Al) were investigated. The alloys were irradiated with 2 MeV protons and Ar{sup +} ions at low temperatures ({minus}175 to {minus}135C) to max fluences of 4.5 {times} 10{sup 15} Ar{sup +}/cm{sup 2} and 2 {times} 10{sup 17} H{sup +}/cm{sup 2}. Yield strengths of unirradiated TiAl and the fracture strength of unirradiated Ti{sub 3}Al were 367 {plus_minus} 33 MPa and 536 {plus_minus} 30 MPa, respectively, in excellent agreement with published data. Yield strength of TiAl and fracture strength of Ti{sub 3}Al increased as a result of irradiation. Strengths of both alloys were lowest for the samples irradiated to the highest Ar{sup +}-ion dose, but otherwise there was no correlation of strength with dose. The nanohardness of irradiated specimens generally increased with dose, but influence of dose on Young`s modulus was erratic. Plate-shaped defects vacancy in character, and helical dislocations were observed in irradiated TiAl by TEM. The Ar{sup +}-ion irradiation-induced microstructure of Ti{sub 3}Al contained defects producing mottled contrast at 1 dpa and black-spot contrast at 5 dpa. Irradiation-induced loss of long-range order was also observed in both alloys. Influence of these microstructural variables on mechanical behavior is discussed.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1993},
month = {9}
}

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